V- I cosj i U f P2. - cosj.
V - . , . 12.3.
, , P 2= const , P 1= mUIcosj = const, , , - I = Icosj =const. (.12.3) I i . I i , C . , i d Fd , I¢ - F¢ a . F .
i d E d , . x sa= 0 r a= 0, , -
. 12.3.
, i d const. , , 90 . , A'B', , I' .
. 12.3 V - . 1 .12.3 , - , ; x c - .
. 12.4 V- I = f (i ) cosj = f(i) P2= 0 ( ) P2= const ¹ 0.
.12.3 . 12.4 1 , , Q>0; 2 - , Q = 0 cosj = 1; 3- , , Q < 0; 4 , Q Q . Q - U E.
. 12.4.V-
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Q , . . 12.3, P2 =const ¹ 0 Q 4 - Q =90. 4 CD .12.4, . i < i 4 .